How to assign freestyle attributes to different objects for rendering?
If there's no  'in camera' discriminator between your Line-Sets, you may have to render them into different View Layers, and combine the layers in the Compositor.
But you can probably just link the meshes into distinct collections, and associate each Line-Set, (along with its style and its edge-selection method), with those collections:

It would depend on your case. Maybe you can illustrate it.